Combined valve and dust cap



Jan. 30, 1923, 1,443,429. r

H. A. OGLE.

COMBINED VALVE AND DUST CAP.

FILED JUNE 6, 1921.

va wii+wdbm [ZZZ/ 6.

lain, 36), 1923,

HARLEY A. oe E, orcrironeo, itLnrnois. i I

coienrnnn VALVE AND DUST car;

1 Application'filcd .Time s, 1921. seriai'noiavsscs. i

'1 'o alt whom it may con cern Be it known that I, lilanLnY A: Oenn, a

citizen of the United States, and resident of Chicago, in thecounty oi Cool: and State of nu-nos, have invented certain new and useiulImprovements in a Con' hined Valve and Dust Cap, of which the :tollowing is a specification.

'My invontion relates to improvements in valves fOIlDDGLlIIlZLl/lC tires and'has special 1 reference to improvements in dust caps for such valves. By means of my invention 1 provide a positive loclzjior the dust cap; Iprovide acap that can he very quicklyappliedand removed; and I provide one which Wlll positively pack the stein against the leakage of air even though the valve -1n the stem should leak. Instead of threading the cap upon the outer threaded surface of the valve stem,

which is the'usual manner of attaching a dustcap, and which does not provide a lock a for the dust cap, I provide the v'alvestem closer with an exte rnal threaded surface of adifi'erent pitch than that atthe extremity ottthe valve stem and '1 thread the outer:

end of my dust cap uponthis outer thread 'edsurface) Thedifi'erencedin the pitcheffectuallylocks thecap against jarring loose 'cnceIithasbeen'set. p p 'i fA further-feature of my invention relates to an improved packing washer which I provide. To avoid the destruction of the" washers a-ntlalso to avoid any necessity of anti-friction devices I make. a! cup-like "washer ofisuch material ,that it will slide a and in which Figure 1 1s a fragmentary sectional view uponandlnot stick to the bearing surface H ofthe valve stem against which it is forced The cup-like shape provides bv the cap. I relatively thin walls which although the material is "relatively hard, lends yieldahilitytothe washer so that the applied pressure will readily produce tight clos ing contact of the Washer with the stem.

My invention will be more readily-undei'- stood by reference to the accom mnying drawing forming part of this specification,

showing a pneumatic tire equipped with a valve and cap made in accordance with my invention;

Figure 2 is a central longitudinal sectional view of the stem and cap on the line 2-2 of Figure 1; and

- a Figure 3' is a cross-sectional view of the p cap on'the line 33 of Figure l.

In said drawings 1 designates generally a valve with its stein which is adapted to be used in connection with a pneumatic tire 2, the stem 3 is long enough'to project through the telly 4 of the wheel to which the tire is applied and the stem is threaded throughout its length so that a clamping nut 5 can be'run down the stem toclainp the inner tube 6 between'the nut and theinner head 7 on the stem in the 'usualmanner.

In mounting a tire on a wheel, the tire is placed on a suitable rim 8 the valve stem being projected through a suitable hole in the rim and a similar hole in the telly and projects inwardly bet ween'the, spokes o'i the Wheel. Usuallythe steniis long enough to project far enough in towards the center of the wheel so that the connection for the pump, for the purpose of pumping up the" tire, can be readily secured to the inner end of the stem. .The stem adapted to be clamped in the fellyby' a nut '9 adapted to be run onto the stemfrtim its inner end and bear against theinneix'face [of the telly.

The full length "of the stem is often neces 'sary-as it is oftenldifiicu'lt to project the stem throug'h the holes in the rim and telly far enough to he ahle to sta it the nut 9 upon the innerfend of the stem for the pur-- pose of drawing lthe gelatinous; and properly keeping it n the run The outer end'of the, stem i s usually reducediu diameter and externally threaded shown "at 10 for the purpose receiving z thej cap for sealing the outer; end of the stein. It

1S to be understoodtliat within thestein the usual checlrvalve is arranged to hold the 'air in the tire. Theusual anangeinent is to have a small cap 'which screws upon the outer endof the stein anda dust cap which is large enough to cover this cap'and the 1 stem, "the dust capdoeing screwed down upon the outer pro' ecting end of the stem until it contacts Wlth the nut 9.

Instead of the usual form of cap, I make anielongated cap which 1 thread internally at12 to fit upon the i educed free end of the stem and also externally threaded as at 13 a for a purpose to be explained. The outer end 015 the cap is provided with a knurled collar 14 for CODVGIIIGDCQ n screwing the cap on and off and the extreme outer end is reduced in diameter and provided with a notch 15 similar to that usually provided "der side but not projecting clear through the washer. This provides relatively thin walls for the washer which adds to its yieldability, the inner edge 0t this washer is adapted to contact with the extreme outer end 19 of the valve stem and sealsan'ie against the escape of air. V

rt further the washer being relatively hard turns freely upon theouter end of the stem without abrading same and there is no tendency to start the cap back as the case withsoft pack ng washers con'imonly employed.

The dust cap proper which I provide consists of an elongated tubular member 20 of sizeto slide freely over the valve stem 3 and long enough to be seated on the outer surfaceot the locknut 9 as shown at 21 and to project out from the nut to receive-the cap 11. I reduce the diameter of the outer end of the tube as shown at 22 and internally thread it to receive the valve cap. For

.the purpose of finger grips. in order that the tube 20 may beeasily rotated, I provide the outer end thereof with longitudinal grooves 23 providing longitudinal. ribs 26L. As this end of the tube is somewhat removed I from the telly it is in position sothat it can be readily grasped by the fingers the spaces between the spokes being more at this point than at the hubi The standard thread for the outer end of the 'valve stem and the valve cap is 30'threads to the inch {1 inch in diameter and I. preferably make the cap of an. external-diameter of the-pitch of the external thread 13 oftheandmake cap 24lthreads'to the inch. This difference 1n pitch of internaland external threads of the cap is of importance in-locking the cap "and the tubular member in place torthe reason that theleast retrograde movement v advantageous feature of the peculiar packing washer which I use is that of the cap will tend to tighten the tube in place once the member has been set upon the valve stem. The preferable manner of plac-' ing the cap and tube upon the stem is to screw the cap into the tube not quite far enough to seat the tube when the cap is seated, then to seat the cap upon the stem and thereafter to screw down" the tube and seat it upon the nut 9 thus eitectua-lly looking both the tube and the cap to prevent either of them jarring loose.

. In removing the dust cap I first back olf the tubular member enough to free it from the nut 9 and then by grasping the knurled collar 14, the cap can be readily loosened. The cap is not readily lost as frequently occurs with the usual separate cap, as I leave the cap and tube together. I preferably make the cap relatively long so as to allow for adjustment of the tubular member to fit different thicknesses of fellies.

As manymodifications of my invention will readily suggest themselves to one skilled inthe art, I do not limit or confine my invention to the specific details of con struction and operation herein shown and described except withinthe scope of the ap pended claims.

Iclaim: I y 1. In a dust protector tor the valve stem of a valve for a pneumatic tire, a tubular member adapted to slide freely over the stem and be seated at its inner end against a shoulder surrounding the stem, the stein having a reduced externally threaded outer end, a cap for the stem internally threaded to fit the reduced endof the stem, a packing washer within the cap, the c l? externally threaded and the tubular member reduced at its outer end and internally threaded to fit the capythe pitch ofthe external thread on the cap beinggreater than that of the internal thread. I I

2 A packing washertor the purpose described of cup-like form of sufiicient hardness to slide under pressure on the end. of a valve stem, the open endlof the. cup presented to the, valve stem, the wall of the cup "being thin enough to provide sutlicient yieldability .tor the purpose described.

. Signed at Chicago. Illinois, this 1st day of June. 1921.

'HARLEY A. OGLE. 

